It's on the roadmap for 1.3
When is JBossCache 1.3 with this feature going to be available?
Manik, Ben and I are meeting Oct 5-8 to discuss the next releases (1.2.5, 1.3, possibly a 1.2.6).
We'll know more after that date. Buddy Replication is one of the top priority issues in 1.3.